Soap Dispenser Stroke Adjuster for Variable Dose Control
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Solution Overview
Problem
Existing soap dispensers lack the ability to adjust the amount of soap dispensed per activation, which can be inadequate for varying levels of hand soil in different settings, such as public restrooms or healthcare facilities.
Innovation Solution
A dispenser equipped with a stroke adjuster that can be oriented in two positions, altering the engagement point of the pump engagement surface, thereby adjusting the length of the meaningful pump stroke and the amount of soap dispensed without affecting the full pump stroke, ensuring the dispenser remains functional even if the stroke adjuster is misplaced or removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pump stroke length is increased to provide more soap for heavily soiled hands, then the soap allocation is improved, but the device complexity increases due to the need for adjustable mechanisms
Solution Approach 1:
The patent implements a dynamic adjustment mechanism where a adjustable stop can be positioned at different locations along the pump rod travel path. This allows the pump stroke length to be dynamically changed between a first position (for normal soap dispensing) and a second position (for increased soap dispensing), enabling the system to adapt to different hand soil levels without requiring a completely complex redesign
Solution Approach 2:
The patent changes the physical parameter of pump stroke length by adjusting the stop position relative to the pump rod. The stop can be positioned to limit the pump rod travel at a first location for standard dispensing, or at a second location to allow greater travel for increased dispensing. This parameter adjustment enables flexible soap allocation based on contamination levels
2Manufacturing precision
If the dispenser is designed to require precise assembly of the stroke adjuster, then the manufacturing precision is improved, but the ease of operation deteriorates due to potential misplacement
Solution Approach 1:
The patent employs asymmetric design features including a cam-shaped follower and correspondingly shaped cam surface on the adjustable stop. This asymmetric geometry provides natural guidance during assembly, ensuring the follower engages the cam surface in the correct orientation. The asymmetric shapes make it difficult to install the components incorrectly, thereby maintaining manufacturing precision while improving ease of operation
Solution Approach 2:
The cam-shaped follower acts as an intermediary element between the adjustable stop and the pump rod. Its cam surface geometry mediates the interaction, providing both positioning guidance and mechanical advantage. The intermediary design ensures proper engagement and orientation while simplifying the assembly process through self-aligning features
Data Source
AI summary
A stroke adjuster and an associated dispenser are provided. An example embodiment provides a dispenser configured to dispense a fluid or foam and comprising a housing and a stroke adjuster. The housing comprises at least one housing engagement surface and defines an adjuster receiving area. The adjuster receiving area is configured to receive the stroke adjuster in one of either a first orientation or a second orientation. When the stroke adjuster is oriented within the dispenser in the first orientation a first surface is oriented upward and, when the dispenser is activated, a lower pump engagement surface of the pump is engaged by the first surface of the stroke adjuster. When the stroke adjuster is oriented within the dispenser in the second position a second surface is oriented upward and, when the dispenser is activated, the lower pump engagement surface is engaged by the housing engagement surface.